Name one environmental issue associated with agriculture.

Water pollution from runoff is a significant environmental issue associated with agriculture because it occurs when fertilizers, pesticides, and livestock waste are washed away from fields into nearby water bodies during rainfall or irrigation. This runoff can lead to nutrient loading in water sources, causing problems such as algal blooms, which deplete oxygen in the water and harm aquatic life. Additionally, pollutants in runoff can contaminate drinking water supplies and adversely impact human health.

Agricultural land erosion and an increase in carbon sequestration are also relevant topics, but they do not directly reflect the negative environmental impact that water pollution does. While land erosion can certainly degrade soil health and affect crop productivity, and increased carbon sequestration is generally viewed as a beneficial process in the context of climate change, these factors do not encompass the direct harmful effects that water pollution imposes on both ecosystems and human populations. Rise in crop diversification tends to promote biodiversity and improve overall ecosystem health rather than reflect an environmental issue.